FXUS65 KCYS 252058
AFDCYS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
200 PM MST WED NOV 25 2009

.SHORT TERM...TONIGHT THROUGH FRIDAY...
EXPECT CLOUDS OVER FAR EASTERN WY AND THE NEB PANHANDLE TO DECREASE 
LATE THIS AFTERNOON AND EVENING AS SMALL JET MAX ON BACK SIDE OF 
DEVELOPING UPPER LOW OVER THE MIDWEST MOVES OUT OF THE REGION AND 
DRIER AIR MOVES IN. AFTER THAT EXPECT QUIET WEATHER FOR THANKSGIVING 
DAY AND FRIDAY AS UPPER RIDGE MOVES TOWARD AND ACROSS THE REGION 
WITH MOSTLY CLEAR SKIES AND QUITE MILD AFTERNOON TEMPERATURES.  SOME 
LEE TROFFING WILL CREATE SOME LOCALLY GUSTY WINDS IN FAVORED AREAS 
AROUND THE WY MTNS BUT NO HIGH WINDS EXPECTED.

.LONG TERM...FRIDAY NIGHT THROUGH WEDNESDAY. GFS AND ECMWF SIMILAR 
IN SYNOPTIC PATTERN LEADING TO INCREASING CONFIDENCE IN THEIR 
SOLUTIONS.

FRIDAY NIGHT...INCREASING MID AND HIGH CLOUDS AHEAD OF THE NEXT 
SHORTWAVE TROUGH. RELATIVELY MILD NIGHT WITH DECENT LOW LEVEL MIXING.

SATURDAY...RELATIVELY STRONG COLD FRONTAL PASSAGE EARLY IN THE DAY 
WILL USHER IN COLDER TEMPERATURES. SCATTERED SNOW SHOWERS ON TAP 
ALONG AND WEST OF INTERSTATE 25 IN MOIST WEST FLOW ALOFT AND WITH 
SYNOPTIC LIFT AHEAD OF PASSING SHORTWAVE TROUGH.

SUNDAY...COOL DAY IN THE WAKE OF THE SHORTWAVE TROUGH WITH HIGH 
TEMPERATURES IN THE 30S TO LOWER 40S WITH 1000-500 MB THICKNESSES 
NEAR 5400 METERS. ASIDE FROM A FEW OROGRAPHIC MOUNTAIN SNOW 
SHOWERS...WILL BE DRY.

MONDAY...WARMING TREND BEGINS AS THE FLOW ALOFT BECOMES WEST AND 
HEIGHTS AND THICKNESSES INCREASE. HIGH TEMPERATURES IN THE 30S WEST 
AND 40S EAST WITH 1000-500 MB THICKNESSES NEAR 5520 METERS.

TUESDAY...ANOTHER RELATIVELY STRONG COLD FRONTAL PASSAGE EXPECTED 
EARLY IN THE DAY FOR THE FIRST DAY OF DECEMBER AS A SHORTWAVE TROUGH 
SLIDES ACROSS MONTANA AND WYOMING. SNOW SHOWER COVERAGE WILL BE 
MINIMIZED DUE TO LACK OF LOW AND MID LEVEL MOISTURE. 

WEDNESDAY...COLD DAY ON TAP AS SHARP TROUGH CARVES OUT ACROSS THE 
NORTHERN AND CENTRAL PLAINS STATES. HIGH TEMPERATURES IN THE 30S 
WITH 1000-500 MB THICKNESSES NEAR 5190 METERS.

&&

.AVIATION...VFR THROUGH THURSDAY NIGHT.

&&

.FIRE WEATHER...LOCALLY GUSTY WINDS AROUND THE MTNS THROUGH FRIDAY 
BUT NO CONCERNS ANTICIPATED AS HUMIDITIES EXPECTED TO REMAIN ABOVE 
CRITICAL LEVELS AND FUELS NOT TOO DRY.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...NONE.
NE...NONE.

&&

$$

SHORT TERM/FIRE WEATHER...RE
LONG TERM/AVIATION...RUBIN